docs: def add_options(self):
          """ Add configuration options.
          """
          super(ScriptBaseWithConfig, self).add_options()
  
          self.add_value_option("--config-dir", "DIR",
              help="configuration directory [{}]".format(os.environ.get('PYRO_CONFIG_DIR', self.CONFIG_DIR_DEFAULT)))
          self.add_value_option("--config-file", "PATH",
              action="append", default=[],
              help="additional config file(s) to read")
          self.add_value_option("-D", "--define", "KEY=VAL [-D ...]",
              default=[], action="append", dest="defines",
              help="override configuration attributes")